The individual colloidal solutions of Ag NPs and CdTe QDs dispersed in water were prepared and characterized separately. The volume fraction of CdTe QDs and Ag NPs in water in the individual colloids were of the order of \(10^{-6}\)  and \(10^{-7}\) , respectively. Fig.REF  shows the extinction spectra of Ag NP and CdTe QD colloids. The extinction spectrum of Ag NP colloid shows a well-known single LSPR peak at 413 nm, which is typical for small Ag spherical particles in water[1]}. The average size of Ag NPs corresponding to the LSPR is found to be 17 nm using Atomic Force Microscopy (AFM) topography measurement. The extinction spectrum of CdTe QD colloid shows the lowest energy excitonic peak, the 1s-1s transition, at 560 nm. The average size of the CdTe QDs estimated using Peng's formula is \(\sim \)  3.4 nm and also confirmed by AFM measurement [2]}. In the final colloidal solution, CdTe QDs are capped with thiol-glycolic acid (TGA) and Ag NPs are capped by trisodium citrate. Due to the low volume fractions and in presence of capping agents, the individual particles are expected to be well separated in their respective colloidal solutions.
